* class.c (record_base_offsets): New function.
(layout_conflict_p): Likewise.
(layout_nonempty_base_or_field): Use it.
(layout_empty_base): New function.
(build_base_field): Use it.
(build_base_fields): Update comment.
(layout_virtual_bases): Fold in a little code form
layout_basetypes. Use layout_empty_base.
(layout_basetypes): Remove.
(end_of_class): New function.
(layout_class_type): Use it. Adjust.